CS	cigarette smoking
CSE	cigarette smoke extract
ELF-PEMF	extremely low frequency pulsed electromagnetic field
EtOH	ethanol
ERK1/2	extracellular signal-regulated kinases 1 and 2
MSCs	mesenchymal stem cells
PI3K	phosphoinositide 3-kinase
ROS	reactive oxygen species
SRB	Sulforhodamine B
TRITC	tetramethylrhodamine